User's Manual

USER MANUAL 1.34
© 2013 EnOcean | www.enocean.com STM 300 / STM 300C / STM 300U User Manual | Page 4/42
STM 300 / STM 300C / STM 300U
1 MODULE VARIANTS AND RELATED DOCUMENTS
The STM300 Scavenger Transceiver Module is available in several operating frequency vari-
ations:
STM 300: 868.350 MHz
STM 300C: 315.000 MHz
STM 300U: 902.875 MHz
Inside this manual the term STM 300x can be used interchangeably for any of the above
frequency.
This document describes operation of STM 300x modules with their built-in firmware. If you
want to write own firmware running on the integrated micro controller or need more de-
tailed information on the Dolphin core please also refer to:
 Dolphin Core Description
 Dolphin API Documentation
In addition we recommend following our
application notes, in particular:
 AN102: Antenna Basics – Basic Antenna Design Considerations for EnOcean based
Products
 AN105: 315 MHZ Internal Antenna Design – Considerations for EnOcean based Products
 AN207: ECS 300/310 Solar Panel - Design Considerations
 AN208: Energy Storage – Design Considerations
 AN209: STM 300 THERMO OR BATTERY POWERED – Power Supply Alternatives to Solar
Panel
2 GENERAL DESCRIPTION
2.1 Basic functionality
The extremely power saving RF transmitter
module STM 300 of EnOcean enables the
realization of wireless and maintenance
free sensors and actuators such as room
operating panels, motion sensors or valve
actuators for heating control.
Power supply is provided by an external
energy harvester, e.g. a small solar cell
(e.g. EnOcean ECS 3x0) or a thermal har-
vester. An energy storage device can be
connected externally to bridge periods with
no supply from the energy harvester. A
voltage limiter avoids damaging of the
module when the supply from the energy harvester gets too high. The module provides a
user configurable cyclic wake up. After wake up a radio telegram (input data, unique 32 bit
sensor ID, checksum) will be transmitted in case of a change of any digital input value